docs: def printStats(self):
          """ shortcut to pull out useful info for interactive use """
          printDebug("----------------")
          printDebug("Parents......: %d" % len(self.parents()))
          printDebug("Children.....: %d" % len(self.children()))
          printDebug("Ancestors....: %d" % len(self.ancestors()))
          printDebug("Descendants..: %d" % len(self.descendants()))
          printDebug("Domain of....: %d" % len(self.domain_of))
          printDebug("Range of.....: %d" % len(self.range_of))
          printDebug("Instances....: %d" % self.count())
          printDebug("----------------")